It's ok frozen yoghurt, but like what others have said it has more of the yoghurty taste than other frozen yoghurt I have had. There are plenty of flavors to choose from as well as lots of toppings. However, since the final price is determined by weight, you should limit the amount of toppings. If not, you could end up with a hefty bill (for frozen yoghurt standards!).
If you need to get a quick fix of something sweet to cool down, Yeh is not a bad choice.